getTopologyValue used subject ID as direct array index (arr[subjectId] ?? 0),
but solver subject IDs are 1-indexed while topology arrays are 0-indexed parallel
arrays. This produced wrong results for any subjectId != position+1.
Fixed by using world.subjects.ids.indexOf(subjectId) to map subject ID to array
position, matching the predicate evaluator's getTopologyValueBySubject pattern.
Affected callers: evaluateAttachedToScrollContainer, evaluateInStackingContext.
The predicate-based evaluators in predicates.ts were already correct.
John Dvorak
2bdda12030